add crud controller

src/main/java/com/example/demo/DemoApplication.java

 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
 
 @SpringBootApplication
 public class DemoApplication {

src/main/java/com/example/demo/user/UserController.java

+package com.example.demo.user;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.List;
+
+@RestController
+public class UserController {
+    @Autowired
+    private UserRepository userRepository;
+
+    @RequestMapping(path="/users/search")
+    public User getUserByName(@RequestParam("name") String name) {
+        return userRepository.findByName(name);
+    }
+
+    @RequestMapping(path="/users/active")
+    public List<User> getActiveUser() {
+        return userRepository.findAllByActive(true);
+    }
+}

src/main/java/com/example/demo/user/UserLoader.java

     public void run(ApplicationArguments args) throws Exception {
         User user = new User("kiki");
         repository.save(user);
+
+        User user2 = new User("Dee");
+        user2.setActive(true);
+        repository.save(user2);
     }
 }

src/main/java/com/example/demo/user/UserRepository.java

 package com.example.demo.user;
 
 
+import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.CrudRepository;
+import org.springframework.data.repository.query.Param;
 import org.springframework.stereotype.Repository;
 
+import java.util.List;
+import java.util.Optional;
+
 @Repository
 public interface UserRepository extends CrudRepository<User, Long> {
+
+    User findByName(String name);
+
+    List<User> findAllByActive(Boolean active);
+
 }